Rivet-slitting machine



Feb. 24, 1931. E. B. STIMPSON ET AL 1,793,648

' RIVET SLITTING MACHINE Filed April 22, 1927 6 Sheets-Sheet 1 Feb; 1931- E. B. STIMPSON ET AL 1,793,648

:uvm sm'rwme MAEHINE Filed April 22} 1927 6 Sheets-Sheet 2 Feb. 24, 1931.

E. B.\ $T|MPSON ET AL RIVET\ snn'rme momma:

Filed April 22, 1927 6 Sho'etwheet 3 I NTOR Feb. 24, 1931. E. B. STIMPSON ET AL RIVET SLITTING MACHINE 6 Sheets-Sheet 4 Filed April 22, 1927 Feb. 24, 1 31- E. a. s-nMPoN ET AL 13 5 RIVET SLITTING MACHINE Filed April 22, 1927 6 sheets-sheet 5 an; HWZM,

NVENTOR s f ATTORNEY 1931. v E. a. STIMPSON ETAL 1,793,643

RIVET SLITTINU MACHINE Filed April 22, 1927 6 Sheets-Sheet 6 Patented Feb. 24, 1931 UNITE, stars PATE ToFFicE EDWIN B. srIMrson AND JosErHr. sUEssLn; OFIBROOKLYN, NEW YORK, ASSIGNORS T EDWIN B. srnsrson coitranr, or nnoorzrrn, new Yon A'ooRroRA'rIon or avnwrom: I

Application filed Am-n '22,

This invention relates to'a slotting inach'ine for use in the manufacture of forked rivets. p

An object of the invention is to'provide a high-speed machine capable of producing the rivets accurately and rapidly. To this end the machine embodies a cutting disc havembodying the invention;

Fig. 2 a side elevation of the machine; Fig. is a plan view partly in section of a portion 01" the machine;

Fig. a section on line 4- l of Fig. 3;

Fig. s-an elevation of an improved saw blade; p

Fig. (1 is a plan oi? the blade of Fig. 5;

Fig. 7 is an elevation or" a different form of blade; p

Fig. 8 is a plan of the blade of Fig. 7;

Fig. 9 is an elevation of a rivet showing the work performed by the saws of Figs.

I I i 10 is an elevation partly in section of a further modification of saw structure;

Fig. 11 is a plan of the blade of 10; Fig. 12 is a section on line 1212 of Fig. 10;

Fig. 13 the work Referring to the drawings more specifically, the numeral 10 indicates the frame work which supports the table 11. A shaft 12 mounted in the framework carries a cutter head comprising a disc 13 upon which are mounted two oppositely located sawsl l and 15 which extend excentrically beyond the is an elevation of a rivet showing performed by the blade of Figs.

RIVET-SLITTENG- mourns 1927. Serial No. 185,721.'

periphery of the disc 13. The disc I so mounted that thesaws project into a slot 16 7 formed in the table 11. A stationary anvil 17' having a notched and slotted nose is removably secured to the table directly over the slot 16, and a holder 18havingasimilarly formed nose is slidably mounted in antipodal relation to the anvil 17 and is confined in a groove .19 formed in the table. A spring 20 has one end anchored to the holderand its opposite end attached to the' table and tends to press the holder toward the anvil. The rear end of holder 18 is bent downwardly and carries an adjustable stop screw 21 for limiting the movement of the holder toward the anvil to thereby prevent contact of the holder with the anvil should the machine tail to feed a rivet to holding position.

A cam-shaft 22 is journaled over the central part of the table on supports 23'and 24.

A lever 25 is pivotally attached to the support 23 and carries at its upper end a roller 26 engaging a cam 27 keyed to shaft 22. The lowerend of lever 25 carries a pin 28cm gaging a block 29 secured to the holder 18.

A rotatable post 30 fits in a sleeve, 7 31 mounted on the table, the lower-end of the post carrying the'feed disc 32 located on'the bottom of the post by dowels32 and secured thereto by screws 32, while to its upper end is attached the gear 33, which is operated by a segmental thread 34: on the shaft 22.

The feed disc 32 hasa plurality of notches I 35 formed in its periphery, the rivets being fed to the notches in the following manner.

A chute of any conventional design delivers the rivets one after, another to a groove 36 formed in the table 11 normal to the periphery of the feed disc. A slide 37 moves in the groove 36 and is pressed toward the disc by spring 38. A lever 39 is pivoted at 40 to an upright 41 and has. its lower end engaged with the slide 37 while'its upper end carries a roller 38 engaging the lateral taceof a cam 39' rotated by shaft 22. The cam operates through lever 39 to pull the slide 37 backward, and at the appropriate moment, when a notch 35 is in registry with the groove 36, the cam permits spring 38 to move the slide forward to push therivet into notch 35 of the feed disc, which carries the rivet along the wall 42 formed on table 11 until it arrives in front of anvil 17.

Then the rivet arrives in this position the cam 27 permits spring 20 to move the holder forward to press the shank of the rivet against the anvil. At the same time the thrust arm 42 descends to engage the head of the rivet.

The thrust arm is pivoted at 43, and its. is resiliently pressed against] operating end the head of the rivet by springs 44 attached to the rear end of the thrust arm and suspended from a pedestal 45 rising from the table. An adjustable stop screw 46 is also carried by the pedestal and engages the rear end of the thrust arm to limit the downward movement ofits forward end, the stop operating to keep the thrust arm from engaging with the feed disc ifthe machine should fail to deliver a rivet to the holding position. The

- rear'end of thethrust arm is pressed downward to disengage its operating end from the A gear 54 keyed rivet-by means of a bell crank lever 47. The lever 47 is pivoted at 48 and its upper branch carries a roller 49 cooperating with a cam 50 on shaft 22.

The machine is driven through a gear 51 mounted on shaft 52 and rotated by pulley 53.

51 and drives gear 55 on shaft 22 through an idler gear 56. The gearing is so designed that the cam shaft 22 makes two revolutions for each single revolution-.ofshaft 12, and in this way the feed mechanism and holding devicesare operated in .a manner to present a 44 to press thelthrust arm 42 down upon the head of the rivet. firmly butresiliently held both laterally. and

vertically, and the saw 15 now passes into the slots of the holder and anvil-to'enga-ge and cut the shank ofthe rivet. 7

After saw 15 passes'the feed disc is again rotated to bring afresh'rivetto cutting position. For each movement of the feed disc I the slide 37 operates to place a rivet into a slot. 35 and the cam 57 engages one of the finished rivets to discharge it from the machine.

Inthis machine the stationary anvil 17 and the holder 18 are both-readily-replaceable and are relatively inexpensive parts. By placing the cam shaft 22 directly over the holder I and near thecutting position the various movto shaft 12 meshes with. gear In this manner the rivet is ing parts can be operated through direct and compact mechanism. 7

It will be seen that'the feed disc 32 is a conveyor which engages the head ends of the rivets and leaves the major portion of the rivet-shanks free. Accordingly, when a.

rivet has been advanced to cutting position, the shank of .the rivet is free to be clamped by the clamping means 17 and 18 without disturbing the relationship. between therivet' and the conveyor disc 82. Then after the rivet has'been slotted and released by'the clamping means, the conveyor disc still has control of the rivet and conveys it away from the cutting position.

- In the particular form tithe invention showirthe cutter head carries two cutters 14 and 15 which pro ect from the periphery of the cutter. head'but together occupy a por-' tion only of such periphery. 1Accordingly,

in each rotation the cutter head has 'two active periods (viz. the periods when, thecutters are passing the slotting station) and two idle periods (viz. the periods when the cutters are out of the way). During each idle period of the cutter head a rivet is advanced laterally into cutting position and clamped for slotting. Then during the next succeeding active period of the cutter head, the clamped rivet blankis slotted.

In the machine heretofore described the saws 14 and 15 are of a usual type designed to cut a tapered slot through the shank of a rivet. But the machine can also be equipped, with the modified types 'of'saw blades illustrated in Figs. 5-13.

In some cases-it is desirable to put a bevelled edge on the inside of the prongs of the rivet as shown at 60 in Fig. 9. In order to cut this bevel the saw blade is provided with a separate section having its sides converging at a steeper angle than those of the main blade. In 5 this separate section for cutting the bevel is indicated at 61 and is adapted to be placed at the leading edge of the main blade 62 and to be clamped in placev the bevel-cutting section 63 being placed between the sections 64 and 65 of the slitting blade.

For other purposes the rivets should be bevelled on their outer edges as at 66 in Fig. 13. For this purpose the bevelling section 67 is attached to the slitting blade 68, the

bevelling section-being composed of two anvil member, a slldmg holder, a spring nor- Figs. 10-12 are rigidly clamped to the rotating wheel in such-a manner as to form a substantlally unitary structure. We claim:

1. A rivet slotting machine including a'- stationary anvil adapted to engageone side of the shank of a rlvet, a movable holder adapted to engage the opposite slde of the rivet shank, a feed disc having a notch to en-; gage under the'head of a rivet, the time be ing-mounted to .carry the rivet into position with its shank between the anvil and the holder, and means for-resiliently pressing againstthe head of said rivet held between said anvil and holder.

adapted to engage the opposite side of the rivet shank, and a feed disc mounted to rontate above the anvil the disc havin a alurality of notches to engage under the heads of the rivets, and means to rotate the disc to carry a rivet into position with'its shank between the anvil and the holder.

mally pressing the holder toward the anvil, a

projection on the -holder,'a camshaft located above the holder, a lever cooperating with a vicam on the cam shaft and engaging the proj ection on the holder to move the holder away from the 'fi-llVll, and means comprising a thrust arm resiliently pressing against the head of said rivet.

3 4. A rivet slottingmachine comprisinga table,a cutting disc carrying saws adapted to project through a slot formed in thetable, means for feeding a rivet to the cutting disc, a movable holder adapted for engagement .with the shank of the rivet, a lever for operating the holder, a thrust arm adapted to engage the head of the rivet, a lever for oper-. ating the thrust arm, and a cam shaft journaled above the table and projecting over the iiholder, said shaft carrying cams cooperating' with the levers.

5. A machine foroperating on the shanks of rivets including means to clamp the shank ofa rivet at an operating station; means to convey rivets successively to the operating station, said conveyor means comprising a thin member having spaces to receive short lengths of individual rivet shanks adjacent the heads of the rivets; means toinsert rivets in said spaces with the heads of therivets adjacent one surface of said thin member and with the shanks of the rivets projecting from the other surface of the thin members; means to clamp the head of a rivet against said thin member when the rivet is at the operating 3; A rivet slotting machine includingan station; and means to actuate said "head clamping means in timed relation tosaid conveyor means whereby said head clamping means. is moved into-clamping position after? a rivet has arrivedat the operating station and is-t'restored to non-clamping position beforethe rivet starts to leave the operating station.

of rivets including means to clamp the shank of a rivet at an operating static-11; means to 6. A machine for operating on the shanks convey rivets successively to the operating p station, said conveyor means comprising a;

- said member and with the shanks of the 2. A rivet slotting machine including astationary anvil adapted to engage one'side of the shank of a rivet, a movable holder rivets projecting from the other surface of said member; spring pressedmeans to clamp the head of rivet against said member when 5 the rivet .is at the operating station; and

means to actuate said head clamping means in. timed relation to saidfconveyor means whereby said head clamping means 1s moved into clampmg' positlon after a rivet has arnrived at the operating station and is restored to non-clamping position before the rivet starts to leave theoperating station.

7. A machine for operating on the shanks of rivets including a plurality of cooperating clamping means operable toclamp the shank of a rivet at an operating station; means to convey rivets successively to the operating station, said conveyor means comprising a tlnnmember having spaces to receive short lengthsof individual rivet shanks adjacent I the'heads of the rivets; means to insertrivets in said spaces with the'heads of the rivets adjacent one surface of said thin member and with the shanks of the rivets projecting from the other surface of the thin member means to operate at least one of said cooperating clamping means in timed relation to said conveyor means whereby such clamping means is moved into clamping position afterthe rivet has arrived at the operating station and is restoredto non-clamping position before the rivet starts to leave the operating station; means to clamp the head of a rivet against said thin member when the rivet is at the operating station; and means to actuate said head clamping means in timed relation to said conveyor means whereby said head clamping means is moved into clamping position after a rivet has arrived at the operating station and is restored to non-clamping position before the rivet starts to leave the operating station.

8. A machine for operating on the shanks of rivets including a plurality-of cooperating clamping means operable to clamp thershank of a rivet under spring pressureat an operating station means to convey rivets succestimed relation to said conveyor means whereby suchclamping means'is moved'into clamping position after the rivet has arrived at the operating, station and is restored to noniclamping' position beforethe rivet starts to leave the: operating station; spring, pressed means to clamp therhead of "a rivet against 7 said thin member when the rivet is at the operatlng station; and means to actuate said head clamping means in timed relation to sa1d conveyor means whereby said head clamping, means is moved into clamping POSltlOIl after a rivet has-arrived at the operatingistation and 1s restoredto non-clamp1ngposition before the rivet starts to leave the operating station; o

9. A rivet slotting machine compr sing thin circular feed membervpositioned in a substantially horizontal plane and havingits .periphery notched to receive rivet shanks,

means to insert'rivets' heads up in the notches whereby the rivets are suspended by their heads with their shanks projectingbelow said feed member; means to-rotate said feed mem- .ber step by step to advance the suspended rivets successively to a slottingstation; means to clamp the heads of the rivets at the slotting station; and means to clamp the shanks of 1 the rivets at theslotting station, saidshank clampmg'means comprising clamping members arranged to provide slots for the passage of a cutter blade to the shank of a rivet clamped thereby.

10.:A rivet slottmg machinecomprising a rotarycutter head; cutter means projecting from a portion only of the periphery of said cutter head whereby in each revolution of. the cutter head at least one portion thereof is 7 active and at least one portion thereof is period of the cutter .head; and clamping. 6a.;

;idle; rivet conveyormeans operable to engage the head ends of rivets and convey them laterally to and from cut-tingposition with the rivet shanks in the path of said cutter means; means to actuate said conveyor means gin timed relation to said cutter head toad-- Vance a rivet to cutting position during an idle periodot sa1d cutter head and leave sa1d rivet at rest during the succeeding active imeans located between said conveyor means and said cutter head to clamp the shank of said'rivet for slotting by said cutter means.

11, A rivet slotting machine comprisinga rotary cutter head cutter means pro ecting.

ifrom a portion onlyot the periphery of said cutter head whereby in each revolutionpf the cutter headatleast one portionthereof: is active: and "atilleast one portion thereof is idle; rivet conveyor means operable-ainianhorizontali-plane to receive rivets'and convey themsuspendednby their heads-to and from cutting POSltlODfNVlthtlihG rivetshanksa.

in the path of said cutter means; means to actuate said conv'eyorxmeans. inxtimed relation to said cutter head to advance a rivet to cutting positionduring an idle period of said cutter, head and leave said rivet at rest during the succeeding active period ofthe cutter head; and clamping means located be tween said conveyor means and said cutter 'head' to clamp the shank of said rivet for slotting" by said cutter means.-

12; A-r1vet slotting machine comprising a rotary cutter head; cutter means projectlng from a portion only of the peripheryofsaid cutter head whereby in each revolution of the cutter-head at least one portion thereof is active and atleast one portion thereof is idle; rivet conveyor means operable to engage the head ends of rivetsand convey them laterally to and from cutting position with the rivet shanks in the path of said cutter means; means to actuate said conveyor me'ansin timed relation to said cutter head to advance a'rivet to cutting positionduring an 'idle-period'of said. cutter head and leave said rivet at rest during the succeeding active period of the cutter head and clamping -means located between-said conveyor means andsaid cutter head to clamp the shank of sa1d :11V6t for slotting by saidcuttermeans, sa1d clamping means comprising a stationary die member and a; movable die member; the members being slottedto permit passage of the cutter means to the shank of a rivet clamped therebv.

13. A rive-t slottingmachine comprising a rotary cutter head; cutter means projecting from a portion only of the periphery of saidcutter head whereby in caclrrevolution of the-cutter head at least one-portion thereof is active and at least one-portionthereof is idle; rivet conveyor means operableto engagethe head ends of rivet blanks and con-'= vey them laterally to and from cutting poveyor means in timed-relationtosaid-cutter sition with the-rivet shanks in the path ofsaid cutter means; means to actuate said'coirhead to advance a rivet to "cutting position;

during an .idle period of said cutter head-andleave said rivet at restduring the succeeding active period of the cutter head; and clamping means located between said conveyor means and said cutter headto clamp the shank of said rivet forslottmg by sa1d cutter means, said clampingjmeans comprisinga pair of chemembers 0neol'wh1ch1s rigidly held in clamping p'ositionand the other of which is spring pressed to clamping posi tion." 7

14. A rivet slotting machine comprising a cutter head rotatable in a substantially vertical plane, cutter means projecting from a portion only of the periphery of said cutter head whereby in each rotation of the cutter head at least one portion thereof is active and at least one portion thereof is idle; means to suspend a series of rivets by their heads and convey them horizontally to cutting po sition with the rivet shanks depending in the path of said cutter means; means to actuate said conveyor means in timed relation to said cutter head to advance at least one rivet to cutting position during an idle period of said cutter head and leave said rivet at rest during the succeeding active period of the cutter head; and clamping mean-s located between said conveyor means and said cutter head to clamp the shank of said rivet for slotting by said cutter means, said clamping means comprising die members providing a slot to permit passage of the cutter means to the shank of the rivet clamped thereby.

15. A rivet slotting machine comprising a stationary anvil adapted to engage one side of the shank of a rivet, a movable holder adapted to engage the opposite side of the rivet shank to clamp the shank against said anvil, means to feed a rivet into position with its shank between the anvil and the holder, 2 said means comprising a feed disc rotatable above said anvil and operable to sustain a rivet with its shank between said anvil and said holder, and means to slot the shank of V 7 the rivet while it is held between said anvil and said holder In testimony whereof We aifix our signatures.

' EDWIN B. STIMPSON. JOSEPH F. SUE SSLE, 

